[[D]Vincent]

Vincent]I'm not 100% sure this will work but try this.
Open vb/private.php and find:

PHP Code:

  if ($pmquota>0 and $touserinfo[usergroupid] != 6 and $bbuserinfo[usergroupid] != 6) {
    $msgcount = $DB_site->query_first("SELECT COUNT(*) AS messages FROM privatemessage WHERE userid=$touserinfo[userid]");

    if ($msgcount[messages]>=$pmquota) {
      // mailbox full. email user and display error

      eval("\$emailmsg = \"".gettemplate("email_pmboxfull",1,0)."\";");
      eval("\$emailsubject = \"".gettemplate("emailsubject_pmfullbox",1,0)."\";");
      mail($touserinfo[email],$emailsubject,$emailmsg,"From: \"$bbtitle Mailer\" <$webmasteremail>");

      eval("standarderror(\"".gettemplate("error_pmfullmailbox")."\");");
      exit;
    }
  } 


Replace that with:

PHP Code:

 if ($pmquota>0 and $touserinfo[usergroupid] <= 4 and $bbuserinfo[usergroupid] <= 4) {
    $msgcount = $DB_site->query_first("SELECT COUNT(*) AS messages FROM privatemessage WHERE userid=$touserinfo[userid]");

    if ($msgcount[messages]>=$pmquota) {
      // mailbox full. email user and display error

      eval("\$emailmsg = \"".gettemplate("email_pmboxfull",1,0)."\";");
      eval("\$emailsubject = \"".gettemplate("emailsubject_pmfullbox",1,0)."\";");
      mail($touserinfo[email],$emailsubject,$emailmsg,"From: \"$bbtitle Mailer\" <$webmasteremail>");

      eval("standarderror(\"".gettemplate("error_pmfullmailbox")."\");");
      exit;
    }
  } elseif ($pmquota>0 and ($touserinfo[usergroupid]  == 5 or $touserinfo[usergroupid] == 7) and ($bbuserinfo[usergroupid] == 5 and $bbuserinfo[usergroupid] == 7)) {
    $msgcount = $DB_site->query_first("SELECT COUNT(*) AS messages FROM privatemessage WHERE userid=$touserinfo[userid]");

    if ($msgcount[messages]>=100) {
      // mailbox full. email user and display error

      eval("\$emailmsg = \"".gettemplate("email_pmboxfull",1,0)."\";");
      eval("\$emailsubject = \"".gettemplate("emailsubject_pmfullbox",1,0)."\";");
      mail($touserinfo[email],$emailsubject,$emailmsg,"From: \"$bbtitle Mailer\" <$webmasteremail>");

      eval("standarderror(\"".gettemplate("error_pmfullmailbox")."\");");
      exit;
    }
  } 


This might not work though.